They will most probably have another child I think
It sounds so mean, but I think they'll have another child for the content. I get the feeling that they think the number of kids they have makes them unique, so if they can have 7/8 children, then they'll keep the viewers interested.
They've let the praise of their viewers get to them, which is why we're always hearing advice from them these days.
Each to their own, but honestly, if Tim is gonna set up his life so that he is mostly working from home, he needs to help out at home! Ella does everything and even if she likes it, it's disgusting of him to raise his boys to just wait around whilst the girls train to be little wives and mothers.